Plastic mold.



No. 770,846. PATENTED SEPT. 27, 1904. P. D. DAVIS. l

PLASTIC MOLD.

l APPLICATION FILED JULY 3, 1903. NO MODEL. l 2 SHEETS-SHEET 1.

WITNESS/55;

I No. 770,846. PATENTED SEPT. 27, 1904.

F. D. DAVIS.

PLASTIC MOLD.

APPLIOATION ,FILED JULY a, 190s. No MODEL. 2 sHBETs-sHBBT 2.

W JTNESSES: [NVE/V701? y. (mm By las UNITED STATES Patented September27, 1904.

PATENT EEICE.

PLASTIC MOLD.

SPECIFICATION forming part of Letters Patent No. 770,846, datedSeptember 27, 1904.

y Application filed .Inly 3, 1903. Serial N0. 164,153. (No model.)

To all whom t may concern:

Be it known that I, FREDERICK D. DAvIs, a citizen of the United States,residing at Ludington, in the county of Mason and State of Michigan,have invented certain new and useful Improvements in Plastic Molds; andI do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

My invention relates to plastic molds or forms for hollow cement,concrete, or similar blocks. Its object is to provide a readilyadjustable and removable form especially adapted for the formation ofhollow or fireproof concrete or cement blocks. To this end it comprisesthe combination of parts as set forth in the appended claims, especiallya pair of longitudinally and laterally adjustable side plates and a pairof pivoted central plates, forming an air-space.

In the accompanying drawings, Figure 1 is a perspective view of mydevice ready for use, but without the end plates. Fig. 2 is a plan viewWith the end plates in place.' Fig. 3 is a section on the linie a a ofFig. 2. Fig. 4 is a side elevation of the end plate; and Figs. 5, 6, and7 are details.

In the drawings, 1 represents a series of hollow blocks or bricks, thedotted lines inlicating a further building up upon different mes.

2 3 represent side plates, and 4 5 center plates, of the form.

6 represents a bent L-shaped bar. There are two ot these bars, and theyare joined by angle-bars 7, secured to them, and having slots 8, throughwhich pass the shafts of bindingnuts 9, taking into the side of theplates 2 and 3, thus permitting the plates to be adjustably secured, ineffect, to the bars 6. L-shaped bars 10 are secured to the plate 3 andproject over the plates 2, 3, 4, and 5, parallel with the arms of thebars 6 and pivoted thereto at 11, a number of perforations being shownto indicate scope of adjustment.

12 represents an upright to which the central plate is secured. I haveshown four in use, two at each end, their upper ends lying between abent-out part of the bar 6 and the bar 10.

13 represents a nut securing the upright 12. I have shown a number ofperforations to indicate adjustability.

14 is a connecting-rod running along the bottom of the air-space betweenthe central plates, carried by a bracket 15 on one of the plates andcarrying at each end an eccentricdisk 16. Each of these disks is slottedat opposite sides and each slot takes over a pin on one of the centralplates. A link 17 is connected to each eccentric and at the top takesover one of several pins 18.

19 is a lever-arm pivoted to-one of the central plates and connected bya link 2() to the yconnectingfrod 14, so that when it is drawn over ineither direction it will rotate the rod 14 and draw together or pushapart the central plates at the bottom, swinging them on the pivoteduprights 12.

21 is an end plate, with a lug 22 at the bottom at each side taking overa pin 23 on the side plate and a lug 24 at the top taking under a pin25.

26 isa hand-lever pivoted at 27 to the end plate on each side and havinga hooked inner arm 28, which takes over the pin 25.

29 is an adjusting-rod, one at each side, having a threaded part whichpasses through a collar 30 on the end plate. At the bottom each rodtakes into an angle-iron 31,-slotted to receive a pin 32 on the endplate. It is apparent that by turning the rods 29 the device may be usedto adjust or level the form.

33 is a plate which may be use to cover the end of the air-space when acorner-stone is being molded, an arrangement for that purpose beingshown.

With the parts assembled as they are in Fig. 2 an end block may be castsuch as is indicated by dotted lines in Fig. 1. With the parts arrangedas in Fig. 1 a block may be cast fitting up against a' previously-moldedblock and having a central space by simply pouring the materiai on eachside of the central plates. When the mixture is in place and fixed, thecentral plates may be loosened by mov-ing over the lever 19 so as todraW together the bottoms of the plates.

When it is desired to mold a form such as shown at Fig. 2, the nuts 9may be loosened as the side plates 4 5 move forward, and again secured,the scope of adjustability being obvious; To enlarge the block, all thatis required is to loosen the pivot l1 and change it to another set ofperforations.

Having fully described my invention, What I claim is- 1. In a plasticmold, the combination of substantially parallel outer plates, andsubstantially parallel inner plates ad justably coupled.

2. In a plastic mold, a pair of laterally and longitudinally adjustableside plates, and a pair of pivoted central plates forming an airspace.

3. In a plastic mold, the combination of a pair of central plates, apair of longitudinallyadjustable side plates, and a separable end plate.

4. In a plastic mold, the combination of a pair of adjustable centralplates, a pair of longitudinally-adjustable side plates, an end platefor the central plates, and an end plate embracing the end of the sideplates.

5. In a mold for plastics, the combination of a series of side andcentral plates, an end plate, pins on the plate, slotted angle-iron feetplaying over the pins, and threaded adjusting-rods passing through theangle-irons.

. 6. In aplastic mold, the combination of side plates connected byadjustable bars, a pair of central plates, a connecting-rod, aneccentric at each end of the rod engaging each central plate, an armleading from the eccentric to the top of the plate, means for securingthe arm, and an operating-lever.

In testimony whereof I aix my signature in presence of two witnesses.

FREDERICK D. DAVIS. Witnesses O. J. GARIGAN, L. P. SCHRADER.

